How to get best results when taking blood test.

[Ivyclose1]

Hi, I’m new to this so please forgive any mistakes.

I have had a total thyroidectomy, this was done in 2015. I have since been on 100mg of levothyroxine. I wake up in pain everyday as my joints hurt. I saw the GP who is sending me for blood tests.

What is the best time to have them done and when should I stop taking meds to get a more accurate reading.

Thank you.

[SlowDragon Administrator]

For full Thyroid evaluation you need TSH, FT4 and FT3 tested. Also extremely important to test vitamin D, folate, ferritin and B12

Low vitamin levels are extremely common, especially if your FT3 is low

Recommended on here that all thyroid blood tests should ideally be done as early as possible in morning and fasting. Last Levothyroxine dose should be 24 hours prior to test, (taking delayed dose immediately after blood draw). This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip, best not mentioned to GP or phlebotomist)

Is this how you do your tests?

Private tests are available. Thousands on here forced to do this as NHS often refuses to test FT3 or antibodies or all vitamins

thyroiduk.org.uk/tuk/testin...

Medichecks Thyroid plus ultra vitamin or Blue Horizon Thyroid plus eleven are the most popular choice. DIY finger prick test or option to pay extra for private blood draw. Both companies often have special offers, Medichecks usually have offers on Thursdays, Blue Horizon its more random

After complete thyroidectomy just Levothyroxine may not be enough. You may need the addition of small dose of T3. But VITAMINS need testing and frequently need supplementing to bring levels back to optimal FIRST

Dr Toft, past president of the British Thyroid Association and leading endocrinologist, states in Pulse Magazine,

"The appropriate dose of levothyroxine is that which restores euthyroidism and serum TSH to the lower part of the reference range - 0.2-0.5mU/l.

In this case, free thyroxine is likely to be in the upper part of its reference range or even slightly elevated – 18-22pmol/l.

Most patients will feel well in that circumstance. But some need a higher dose of levothyroxine to suppress serum TSH and then the serum-free T4 concentration will be elevated at around 24-28pmol/l.

This 'exogenous subclinical hyperthyroidism' is not dangerous as long as serum T3 is unequivocally normal – that is, serum total around T3 1.7nmol/l (reference range 1.0-2.2nmol/l)."

You can obtain a copy of the articles from Thyroid UK email print it and highlight question 6 to show your doctor

 please email Dionne at

[e-mail]

Professor Toft recent article saying, T3 may be necessary for many especially after thyroidectomy

rcpe.ac.uk/sites/default/fi...

BTA guidelines

british-thyroid-association...

New NHS England Liothyronine guidelines November 2018 clearly state on pages 8 & 12 that TSH should be between 0.4-1.5 when treated with just Levothyroxine

Note that it says test should be in morning BEFORE taking Levothyroxine

Also to test vitamin D, folate, B12 and ferritin

sps.nhs.uk/wp-content/uploa...

Love your photo 🐱

[Ivyclose1 in reply to SlowDragon]

Hi SlowDragon,

Thank you so much for your response.

I will be following your advice.

It’s so great to be able to get advice from people who are experienced!

Thanks once again